Granted Patent
Utility
US 4,931,694 · App. 07/201,560
Coupled cavity circuit with increased iris resonant frequency
Inventors:
Robert S. Symons, Mark Frederick Kirshner
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Jun 1, 1988
Inventors
Robert S. Symons
Mark Frederick Kirshner
Assignee (at issue)
Litton Systems, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.